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Create file: etc/events.xml

<event name="sales_order_place_after">
    <observer name="sales_order_place_after_event" instance="Vendor\Module\Observer\SalesOrderPlaceAfter" />
</event>

Create Vendor/Module/Observer/SalesOrderPlaceAfter.php

public function execute(Observer $observer)
{
    /** @var Order $order */
    $order = $observer->getData('order');
    $payment = $order->getPayment();
    $order->setState('new');
    $order->setStatus('pending');
}